ART. I. On a New Optical and Mineralogical Structure exhibit-
ed in certain specimens of Apophyllite and other mi-
nerals. By David BrewsTER, LL.D. F. R. S. &c. 1
II. On the Hyposulphurous Acid and its Compounds. By
J. F. W. HERSCHEL, Esq. F. R. S. &c.
III. Application of the Indeterminate Analysis to the elimi-
nation of the unknown quantities from two Equations.
By WILLIAM WALLACE, Esq. F. R. S. Edin. - 29
IV. Description of a New Hygrometer, made of the internal
membrane of the Arundo Phragmites. By ALEXANDER
ADIE, F. R. S. Edin.
V. Account of an Excursion to Thebes, and of the Anti-
quities recently discovered in that City. In a Letter
from a Scotch Gentleman in Cairo, - . 33
VI. Experiments on the Structure and Refractive Power of
the Coats and Humours of the Human Eye. By Da-
VID BREWSTER, LL. D. F. R. S. Lond. & Edin. and
the late John GORDON, M. D, F, R. S. Edin. - 43
VII. Demonstration of a Theorem relating to Prime Numbers.
By CHARLES BABBAGE, Esq. F. R. S. &c, - 46
VIII. Description of the Diamond Mine of Panna. By Fran-
cis Hamilton, M.D. F.R.S. & F.A.S. Lond. & Edin. 54
IX. Description of the Patent Sympiesometer or New Air
Barometer. By ALEXANDER Adie, F. R. S. Edin. 49
X. Method of Weighing Anchors, used by the Natives of
the Coast of Coromandel,
XI. Examination of some Compounds which depend upon
very weak Affinities. By Jacob Berzelius, M. D.
F. R. S. and corresponding Member of the Institute
• of France,
XII. Comparison between the length of the Seconds Pen-
dulum, as determined by Mr Whitehurst and Captain
Kater. By Edward TROUGUITOX, Esq. F. R. S. 75